Limitless Deam

Limitless Deam summary:

Arthur was the ruler of a world where he possessed everything.
The king dreamed about becoming a slave.
In the dream, he became a shabby and insignificant laborer named Hahn-suhjin.
Every day he was a cog in a factory that turned like a machine.
After waking up from the long dream, the king fell into a state of confusion.
Was he a slave dreaming about being a king?
Or was he a king dreaming about being a slave?
Which one was the dream? Which one was the reality?
「Your majesty. Everything within the dream is a lie. Please do not forget about this.」